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This sinister-looking dagger is a drop off of Warchief Rend Blackhand. Its model is not unique, but the coloring is and I highly recommend farming for it despite its low droprate. (UBRS is being "revamped" for Warlords of Draenor, so there's a possibility this weapon will become unavailable.)

Update: Both it and the source were removed in Patch 6.0.2 when the dungeon was revamped for Warlords of Draenor.

As of writing (patch 5.1) this dagger is largely better than many level 90 weapons in the OH of a rogue. The proc has no ICD and an estimated 5% proc chance. Combined with a powerful MH weapon the proc does some serious damage, especially as assassination as poison ticks crit. With some combat dummy tests, I've discovered that being hit capped is required for a DPS gain, also the weapon scales better with gear than most daggers. Making this potentially a good choice come 5.2 once new raid gear is obtained but new daggers are not yet obtained.